linux-kernel - Re: debug_dma_assert_idle - snd_hda_intel - cpu touching an active dma mapped cacheline

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Date:	Thu, 17 Apr 2014 09:40:59 +0200
From:	Clemens Ladisch <clemens@...isch.de>
To:	poma <pomidorabelisima@...il.com>, Takashi Iwai <tiwai@...e.de>
CC:	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Mailing-List fedora-kernel <kernel@...ts.fedoraproject.org>
Subject: Re: debug_dma_assert_idle - snd_hda_intel - cpu touching an active
 dma mapped cacheline

poma wrote:
> Sound whispers,

???

>  WARNING: CPU: 3 PID: 900 at lib/dma-debug.c:593 debug_dma_assert_idle+0x159/0x1d0()
>  snd_hda_intel 0000:00:07.0: DMA-API: cpu touching an active dma mapped cacheline [cln=0x03014000]
>  ...
>  Mapped at:
>   [<c074ec12>] debug_dma_alloc_coherent+0x22/0x70

"Coherent" means "touching DMA mappings is allowed".
Why does dma-debug complain about that?


Regards,
Clemens
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